Export Sales and Shipments for Feb 24 - Mar 2, 2023.  Wheat:  Net sales of 266,700 metric tons (MT) for 2022/2023 were down 6 percent from the previous week, but up 11 percent from the prior 4-week average. Export shipments of 377,100 MT were down 38 percent from the previous week and 24 percent from the prior 4-week average.  Corn:  Net sales of 1,412,100 MT for 2022/2023 were up noticeably from the previous week and up 57 percent from the prior 4-week average. Export shipments of 1,052,000 MT--a marketing-year high--were up 58 percent from the previous week and 74 percent from the prior 4-week average.  Soybeans:  Net sales reductions of 23,200 MT for 2022/2023--a marketing-year low--were down noticeably f...